Pressure release for revolving doors



Jan. 23, 1934. J w sHlELDS 1,944,197

PRESSURE RELEASE FOR REVOLVING DOORS Filed Jan. 27, 1932 4 Sheets-Sheet l Q Z 5 7c in 7 i ix II-.1 E

IN VEN TOR.

ATTORNEY Jan. 23, 1934. w SHELDS 1944,19?

PRESSURE RELEASE FOR REVOLVING DOORS Filed Jan. 27, 1932 4 Sheets-Sheet 2 (IV/Z INVENTOR. 6 112-16. jg w lfidcb,

ATTORNEY;

Jan. 23, 1934. J, w, SHIELDS PRESSURE RELEASE FOR REVOLVING DOORS Filed Jan. 27, 1932 4 Sheets-Sheet 3 as U 1 6 ATTO INVENTOR.

@500, 'RNEY Jan. 23, 1934.

J. w. SHIELDS PRESSURE RELEASE FOR REVOLVING DOORS Filed Jan. 27, 1932 4 Sheets-Sheet 4 INVENTOR /g4 652mm, B "5 a I.

ATTORNEY Patented Jan. 23, 1934 UNITED STATES PATENT OFFICE PRESSURE RELEASE FoR REVOLVING noons Application January 27, 1932. Serial No. 589,266

3 Claims.

'My invention relates broadly to revolving doors and more particularly to the construction of an improved pressure release for revolving doors.

One of the objects of my invention is to pro- 5 videa simplified construction of pressure release for revolving doors which is capable of quantity production inexpensively, and which has a minimum number of parts arranged in such form as to withstand wear over an extended period of time.

Another object of my invention is to provide a simplified construction of hardware for installation upon revolving doors for effecting the collapse of the revolving doors when the doors are subjected to abnormal pressure under condi tion of emergency or panic, the release pressure being selectively adjustable from the exterior of the casement enclosing the hardware.

Still another object of my invention is to provide a construction of pressure release for revolving doors wherein a pivoted latch device is subjected to adjustable spring tension for maintaining a locking head in position for interconnecting by means of cable members the several revolving doors and maintaining the doors in spaced relation subject to collapse under conditions of abnormal pressure against the doors. A further object of my invention is to provide a simplified construction of pressure release hardware for revolving doors into which the locking head of a bracing cable extends and is engaged by a pivoted latch which is subject to predetermined amounts of spring tension for maintaining the locking head in position within the hardware against withdrawal except under conditions of excessive pressure due to excess pressure applied against the revolving doors under conditions of panic or emergency.

Other and further objects of my invention reside in the construction and arrangement of parts of the pressure release hardware for revolving doors as set forth more fully in the specification hereinafter following by reference to the accompanying drawings, wherein:

Figure 1 is a side elevation of a revolving door provided with my improved pressure release hardware; Fig. 2 is a horizontal sectional view on line 22 of Fig. 1; Figs. 3 and 4 are fragmentary views of a portion of the door proper showing front and. rear elevations of the coacting face plates of my improved hardware; Fig. 5 is a vertical longitudinal sectional View taken substantially on line 55 of Fig. 6. Fig. 6 is a horizontal vertical sectional view taken on line 6-6 of Fig. 5; Fig. 7; is aview similar to the horizontal sectional view shown in Fig. 6 but showing the parts of the pressure release in a position they assume when excess pressure is applied towards the wings of the revolving door; Fig. 8 is a horizontal sectional view taken substantially on line 88 of Fig. 5 and showing the parts of the pressure release in a position they assume when the wings of the doors are released and ready to fold; Figs. 9 and 10 are transverse vertical sectional views on the correspondingly numbered lines of Fig. 5; Figs. 11 and 12 are transverse vertical sectional views on the correspondingly numbered lines of Fig. 6; Fig. 13 is a detailed perspective view of one of the elements constituting my improved revolving door hardware; and Fig. 14 is a similar view of the coacting face plate. Reference character 1 designates. a revolving door having four radially extending wings. The revolving door is pivoted at 2 and 3 for rotatron about a vertical axis with respect to the 7 supporting frame structure indicated at 4. The pressure release hardware is shown generally at 5 and is constituted by a casing formed by two coacting plate members 6 and 7 telescopically positioned through a. mortise 5a extending through the door. The plate member '7 has a laterally projecting frame portion 7a cast integrally therewith which is adapted to be aligned with the frame portion 6a of plate 6 for providing a cooperative structure. A screw threaded member 8 extends throughthe frame portion 7a in opposite directions at each end thereof. Each screwthreaded member 8 has a head 8a thereon which is adapted to be revolved by means of a tool for securing the hardware in position with- 9 in the mortise 5a. This permits the hardware to be adapted to mortises of varying size, permitting attachment of the hardware to doors having wide tolerances in the size of the mortises which receive the hardware. The inner ends of the screw threaded members 8 have side clearances and provision is made adjacent one end of the hardware in which block 24 is mounted to allow the end of screw device 8 to be adjusted for varying distances into socket 24a in block 24. The plate 6 andthe laterally extending frame portion 6a is aligned with the plate '7 and the laterally extending portion 7a, and connected therewith by means of screws 6b which pass through the frame 6a and are secured in screw 0 threaded sockets 7c in frame portion 7a. In order to provide interlocking and rigid connections, recesses 7b are formed in the frame portion 7a at spaced intervals allowing the screws 61; which pass into the socket '70 to fully take up any play between the plate portions and to afford an interlocking connection between the plate members. Plate member 6 has an aperture 6d therein connected through a slot with an angularly disposed socket head 60 for receiving the headed end 19 of cable 18 as shown more particularly in Figs. 5, 6, 7 and 8. The opposite plate 7 is provided with an aperture 7d through which the locking head of the opposite end of cable 18 from the adjacent door may be passed as indicated at 17 for engagement with a pivoted latch disposed within the casement enclosing the hardware.

It will be observed that aperture 7d is slightly more than double the width of the locking head 17 as looking head 17 may be displaced laterally in removing the cable from the hardware as will be described in more detail hereinafter. The frame portion 7a is provided with a pair of aligned apertures 10a through which pin 10 projects. The pin 10 is secured in position in the frame portion 7a and provides an anchorage about which coil spring 11 is mounted. Coil spring 11 has oppositely projecting ends indicated at 11a and 11b. The end 11a is engaged by screw device 12 which is adjustable through the plate 7 from the exterior of the door. The adjustability of screw device 12 is very important as this adjustment determines the pressure at which the doors 7 will be released. The opposite end of coil spring 11b engages the end of the pivoted latch 14 as shown. Pivoted latch 14 is mounted to swivel about the pin 15 anchored in apertures 15a in the frame portion 7a. The pivoted latch 14 has a projecting end 16 substantially hook shaped for engaging the locking head 17 of cable 18.

The locking head 17 is moved through aperture 711 in a position immediately adjacent the latched position thereof. This is made possible by depressing the pin 20 having a head 21 which is normally spring pressed by coil spring 22 disposed in the socket 241) of the metallic block 24. The metallic block 24 is supported in the frame portion 7a of plate 7 by means of pins 25 which extend therethrough and anchor in apertures 25a as indicated in Fig. 13. The block 24 is so shaped that locking head 17 may be readily moved through aperture 7d when pin 20 is depressed and then shifted laterally to engage the hook shaped end 16 of the pivoted latch 14. The socket 24b is normally closed by the screw threaded end cap 23 which confines coil spring 22 to a position between the inside face of plug 23 and the head 21 of depressible pin 20. When the locking head 17 is engaged over the hook shaped end 16 of the pivoted latch 14, tension which is placed upon cable 18 tends to draw locking head 17 against the hook shaped end 16 of the pivoted latch member 14. The shape of the hook shaped end 16 and locking head 17 is such that a pair of interengaging coacting surfaces are maintained in a position for insuring interconnecting of the revolving doors 1 through cables 18 for all normal requirements. In the engaged position the locking head 17 has the rear surface thereof in engagement with the block 24 as indicated at 24c. Un-

der this condition the end of the locking head 17 which is provided with a notch, the side walls of which constitute an obtuse angle designated at a, is engaged by the hook shaped end 16 of the pivoted latch where the hook shaped end has coacting surfaces extending at an obtuse angle with respect to each other as indicated by the angle B illustrated in Figs. 7 and 8. The angularly disposed walls on the locking head are arranged to slide with respect to the angularly disposed walls 7 10.. As soon as looking head 17 becomes disengaged from the hook shaped end 16, the pivoted latch returns to the position shown in Fig. 8 by .action of spring 11 on the pivoted latch. Upon such restoration to position the doors are again ready for assembly by the insertion of locking head 17 through aperture 6d by depressing spring pressed pin 20 as heretofore described.

It will be observed that the construction of pressure release hardware shown herein is extremely simple and that a relatively small number of parts are required enabling the hardware to be manufactured inexpensively on a quantity production basis. The relatively small number of parts insures operation of the hardware with minimum adjustments over a long term of use.

While I have described the structure of my invention in one of its preferred embodiments, I desire that it be understood that modifications may be made and that no limitations upon my invention are intended other than are imposed by the scope of the appended claims.

its

What I claim as new and desire to secure by I Letters Patent of the United States is as follows: 1. Pressure release hardware for revolving doors comprising a casing adapted to be set into a door and secured therein with side walls exposed at opposite sides of the door, a latch extending longitudinally in said casing and pivotally mounted intermediate its ends, a cable extending into said casing through a side wall thereof and having a locking head at its inner end engaged by one end of said latch, a spring in said casing engaging the other end of said latch and yieldably holding the latch in position to secure the head of the cable, and a screw threaded through a side wall of the casing with its inner end engaging the spring, said screw being rotatable from its outer end for se-- lectively adjusting tension of the spring.

2. Pressure release hardware for revolving doors comprising a casing adapted to be set into a door and secured therein with side walls exposed at opposite sides of the door, a latching lever extending longitudinally in said casing and pivotally mounted adjacent one end, a tooth being provided at the pivoted end of said lever, a block in said casing adjacent the toothed end of said lever, a cable extending into said casing and having a head at its inner end engaged between the block and tooth of the lever, a post in said casing adjacent the other end of said lever, a spiral spring coiled about said post and having one end engaging the adjacent end of said lever, and a set screw threaded. through a side wall of the casing with its inner end bearing against the other end of said spring, said set screw being rotatable from its outer end for regulating tension of the spring.

3. Pressure release hardware for revolving doors comprising a casing attachable to a revolving door and having side walls exposed at opposite sides of the door, a latch pivotally mounted in said casing, a coiled spring in said casing having one end engaging an end of said latch, adjusting means for said spring engaging the other end of latch and head and said head being formed with a seat, and a spring actuated plunger carried by said block and engaging in the seat of the head for normally retaining the head in engagement with the block.

JOHN W. SHIELDS.

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